diff options
| author | Keith Whitwell <keith@tungstengraphics.com> | 2002-10-10 08:25:40 +0000 |
|---|---|---|
| committer | Keith Whitwell <keith@tungstengraphics.com> | 2002-10-10 08:25:40 +0000 |
| commit | 3d69766ea6df4ab1837f5270beafb13c70ec61e6 (patch) | |
| tree | 5271b98a26b76af2b5133a54498d333e9a07e0d0 /shared-core | |
| parent | 2af90a581d20c983446d354051f0f098a5d4eacb (diff) | |
Jonny Strom's mga_dma.c patch
Diffstat (limited to 'shared-core')
| -rw-r--r-- | shared-core/mga_dma.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/shared-core/mga_dma.c b/shared-core/mga_dma.c index a0ad70e9..3c84de63 100644 --- a/shared-core/mga_dma.c +++ b/shared-core/mga_dma.c @@ -157,9 +157,18 @@ void mga_do_dma_flush( drm_mga_private_t *dev_priv ) { drm_mga_primary_buffer_t *primary = &dev_priv->prim; u32 head, tail; - DMA_LOCALS; + u32 status = 0; + int i; + DMA_LOCALS; DRM_DEBUG( "\n" ); + /* We need to wait so that we can do an safe flush */ + for ( i = 0 ; i < dev_priv->usec_timeout ; i++ ) { + status = MGA_READ( MGA_STATUS ) & MGA_ENGINE_IDLE_MASK; + if ( status == MGA_ENDPRDMASTS ) break; + udelay( 1 ); + } + if ( primary->tail == primary->last_flush ) { DRM_DEBUG( " bailing out...\n" ); return; |